Comparing Two Implementations of a Micromixing Model. Part I: Wall Shear-Layer Flow |
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Authors: | Email author" target="_blank">John?V?PostmaEmail author John?D?Wilson Eugene?Yee |
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Institution: | 1.Department of Earth and Atmospheric Sciences,University of Alberta,Edmonton,Canada;2.Defence R&D Canada – Suffield,Medicine Hat,Canada |
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Abstract: | A Lagrangian stochastic (LS) micromixing model is used for estimating concentration fluctuations in plumes of a passive, non-reactive
tracer dispersing from elevated and ground-level compact sources into a neutral wall shear-layer flow. SPMMM (for sequential
particle micromixing model) implements the familiar IECM (interaction by exchange with the conditional mean) micromixing scheme.
The parametrization of the scalar micromixing time scale is identical to that proposed in a previously reported LS–IECM model
(Cassiani et al., Atmos Environ 39:1457–1469, 2005a). However, while SPMMM is mathematically equivalent to the previously reported model, it differs in its numerical implementation:
SPMMM releases N independent particles sequentially, whereas the previously reported model releases N independent particles simultaneously. In both implementations, the trajectories of the N particles are governed by single-point velocity statistics. The sequential particle implementation is computationally efficient,
but cannot be applied to the case of reacting species. Results from both implementations are compared to experimental wind-tunnel
dispersion data and to each other. |
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Keywords: | |
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